Our figure of this species (Plate XXXVI.) was put upon the stone by Smit from an original sketch by Wolf which is now in the possession of Sir Douglas Brooke. Unfortunately we have been unable to make out from what specimen it was originally prepared. _August, 1896._ [Illustration: THE BOOK OF ANTELOPES, PL. XXXVII. _Wolf del. J. Smit lith._ _Hanhart imp._ M^{rs.} Gray’s Waterbuck. COBUS MARIA _Published by R. H. Porter._] 63. MRS. GRAY’S WATERBUCK. COBUS MARIA, GRAY. [PLATE XXXVII.] _Kobus maria_, =Gray=, Ann. Mag. N. H. (3) iv. p. 296 (1859) (Bahr-el-Gazal, _Petherick_); =id.= Cat. Rum. B. M. p. 16 (1872); =id.= Hand-1. Rum. B. M. p. 87 (1873); =Gerrard=, Cat. Bones Mamm. B. M. p. 239 (1862); =Petherick=, Travels in Centr. Afr. i. p. 159 (1869). _Cobus mariæ_, =Ward=, Horn Meas. p. 91 (1892); =Lyd.= Horns and Hoofs, p. 224 (1893). “_Adenota megaceros_, Heuglin,” =Fitz.= Sitz. Ak. Wien, xvii. p. 247 (1855), nomen nudum; =Heuglin=, Ant. u. Büff. N.O.-Afr. (N. Act. Leopold.-Carol.) xxx. pt. ii. p. 14, t. ii. figs. 7, 8 (1863) (descript. satis acc.); =Marno=, Reise in der Aegypt. Aequat.-Prov. p. 40 (1878). _Kobus megaceros_, =Marno=, Reise im Geb. d. blauen u. weissen Nil, p. 387 (1874). VERNACULAR NAMES:--“_Abohk_” of the Dinkas; “_Til_” of the Nuehrs. Height at shoulders about 35–40 inches. General colour dark reddish brown. Forehead and nose dark brown, as are also the inner sides of the fore limbs and breast. Chin and a narrow band along the upper lip white, the latter continuing upwards behind the nostrils and there passing into brown. A spot in front of the eyes and the space between the eyes and ears whitish. This spot is separated from the superciliary stripe by a dark band descending from the base of the horn to the eye. Inside of ears whitish. A white band of hair on the hinder part of the head extends on both sides to the ears and forms a crescent-shaped mark; it then descends the back of the neck and widens into a large white patch above the shoulders. Middle of belly and inner sides of the hind limbs white. Tail long, above like the back, beneath white, tufted end black. A white line round the hoofs. Toes rather longer and stronger than in _C. leucotis_. Hairs of the cheeks and fore neck elongated and mane-like as in _C. ellipsiprymnus_, and muffle broad and naked as in that species. Size between that of _C. leucotis_ and _C. lechee_. Horns strongly ringed, long and strong, projecting backwards, diverging in the middle, and approximating again towards the tips. Length along the curve (type specimen) about 27 inches, in a straight line from back to point 19¼ inches, distance between tips 13¾ inches. _Female_ similar, but hornless, and not so deep in coloration.